Wrench



I 1.637 590 Aug. 1927' I N. H. ROBINSON WRENCH Filed April 8. 1924 jhv @7220 r Jva/ilaw ifi 0 5621s on QQWWw W a??? fgs Patented Aug. 2, 1927.

UNITED STATES I 1 1,637,590" PATENT OFFICE.

NATHAN I ROBINSON, or RAiN'rREE, MASSACHUSETTS? WRENCH.

Application filed April 8,1924. Serial No. 704,954.

p This invention pertains to wrenches and more particularly to wrenches having relatively movable jaws.

renches of this type are employed. in .perfonning a great variety ofmechanical operations frequently involvinguse indif- 'ficultly, accessible and restricted places where it is practically impossible to em-i ploy both hands for manipulating and adjusting'the wrench parts, and the principal 'objectof the prevent invention is to provide a wrench'ot thetypereferred to havmg its parts so designed that the user may Further objects' are to provide a'wrench of the character described "in which ade flange 13 if preterrcd, 1s pI'OVlClGtlf-ifltll a plurality of c1rcumterentially spaced openquate force may readily be applied for adjusting the jaws without the assistance of positively in adjusted position if desired,

and to embody the several features of im-,-

tions being shown in the accompanying drawmgs,1n wh1ch:

F'g. 1 is a fragmentary side elevation of a pipe wrench embodying the invention;

Fig. 2 is an end elevation of the wrench shown in Fig. 1 viewedfrom its right hand end as illustrated in saidfigure; and

Fig. 3 is a longitudinal section substan tially on the line 3-3 ofFig. 2.

Referring to the drawings, the numeral of plates secured to the'opposite faces of the shank 3 by means of rivets 6; p

. the sleevelike holder another wrench or similar tool; .to furnish means by which the aws may be secured pipe or" Stillson wrench, such exemplificaend with a pair of spaced substantially par- Thenumeral 7 indicates a sleeve-likehold er having a lateral ollset member 8 which isdisposed between the ears 4 and and 1s pivotallysecured to the latter by means of .a pin 9p Forbest results this pin is arranged adjacent to that end of the offset 8 nearest to the fixed jaw 1. At a point adjacent to its opposite end the offset 8 is provided with a pocket 10 in which a spring 11 is -seated.

adjacent face of the shank 3 and thus tends This spring bears against the to swing the holder in a clockwise direction about the axis of the pin 9.

A handle 12 is 'journaled to turn freely in 7. The forward end of the handle is furnished with a flange 13 which bears against one end of the holder,

.while a collar 14- is secured to the handle at the opposite endotthe holder by means of a set screw, the flange and collar preventing axial movement of the handle relative ly-to the holder. vThe collar 141-, or the ings '15 either of which may be brought into alignment, by rotation of the handle, with an openinglfi in the end of the sleeve 7.

lVhen so aligned, a pin 17 having a head 18, may be passed through the aligned open-. ings to prevent further rotation of the handle. Preferably the pin 17 is screw-threaded and the holes are threaded to receive the pin, thusminimizing danger of loss of the pin." As a further or alternative safe guard, the pin may be attached to the handle by means of a chain or its equivalent.

The handle is provided with an axial internally screw-threaded bore 19 extending rearwardly to any desired distance from its forward end. The externally screw-thread-' ed stem 20 of the movable jaw 21 of the Wrench engages the threaded bore 19 of the handle. As here shown the stem'or shank 20 and the movable jaw 21 are integrally united but it is within the. scope of the invention to form these parts as separate elements connected in any suitable manner. Preferably the movable jaw 20 is furnished with a slot22 for the reception of the edge of the shank 3 of the fixed jaw, such shank serving properly to guide the movable jaw. as it advances or retreats from the fixed jaw.

p In use the fixed and movable jaws 1 and 21 are placed upon opposite sides of the pipe,

iii

rod, or other work to be manipulated and by rotating the handle, 12 the movable jaw may be advanced into firm engagement with the work whereupon the wrench is manipulated in the usual manner to turn or hold the work.

permit the user to obtain a firm grip thereon,

the elongate extended surface of the handle permitting great force to be applied in moving the jaw 21 toward and from the work. Such force may be applied without removingthe tool fromthe work and by the employment of one hand only, making the implement very convenient for use in restricted situations, or where, as for example when the wrench is being used overhead, it is difiicult to employ both hands at the same time. i V

The wrench thus devised is of very rigid construction, comprising but few parts, and these are simple and easy to manufacture. The engaging threaded portions of the stem and handle are unusually long, thus prolonging the life of the implement and permitting great force to be applied without breaking down or injuring'the screw threads, while the capability of ready manipulation and adjustment by the use of one hand is a manifestly desirable advantage.

I claim:

1. A wrench'comprising a .movable' aw having an integral elongate screw threaded shank, said jaw having a guide groove'in its 'rear face, a substantially cylindrical handle having an internally screw threaded bore in one end to'receive the shank of the movable jaw, said handle having a fixed flange at the end in which the bore is formed, a holder mounted upon the handle to turn freely relatively thereto, one end of said holder bearingv againstsaid flange, a collar secured to the handle and bearing against the other end of the holder to retain thelatter Preferably the exterior surface of the handle 12 1s knurled or roughened to;

in operative position axially of the handle, the last-named end of the holder having a plurality of socket openings therein, a pin carried by the collar, said pin being engageable with any selectedone of said openings to lock the handle against rotation, a fixed jaw having a substantially straight and smooth shank slidab-ly engaging the guide groove in the rear face of the movable jaw, and means attaching th shank of the fixed jaw to the holder.

2. A wrench comprising'a movable jaw having an integral elongate externally screw threaded shank, said jaw having a guide e'ement on its rear face, asubstantially cylindrical one-piece handle having an integral radial flange at one end and an internally screw threaded axial bore extend ing inwardly from said end and adapted to receive the threaded shank of the movable jaw. a holder having a journal opening for the reception of the handle, one end of said holder, bearing against the radial flange, a collar secured to the handle and bearing against the opposite end of the holder,

releasable locking means for preventing rel-- 'tttlVG rotation of the handle and holder, a

fixed jaw having an integral elongate shank provided withan element engaging the guide element on the rear face of the movable jaw, parallel spaced ears projecting from the shank of the fixed adjacent to the end thereof,, a lug projecting from the holder into the space between said ears, a pivot pin extendingthrough said lug and ears to connect the fixed jaw to the holder, and a spring interposed between the end of the shank of the fixed jaw and holder, such spring tending to tilt the fixed jaw about said pivot pin as an axis,

Signed by me at Boston, Massachusetts, this 25th day of March, 1924.

V 1 NATHAN nnoBnvsoN. 

